Casing slip



lug-25,1931. v WHEN 1,820,479

CASING SLIP Filed Jan. 28 1930 Fatented Aug. 25, 1931 UNITED STATES PATENT OFFICE rnnmmrcx J. OBRIEN, or TITUSVILLE, PENNSYLVANIA, ASSIIGNOR 'ro srnu'rnnns wELLs-rI'rUsvILLE CORPORATION, or TITUSVILLE, PENNsYLvANIaA ooRroRA TIOIN' OF MARYLAND CASING sLIr Application filed January 28, 1930; Serial 110,424,089.

vision of a casing slip including a replaces able liner having simple,inexpensive and reliable means for'interlocking the liner therewith against both lateral and circumferential displacement.

Other features of my-invention reside in the novel construction andarrangement ofparts hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings Figure 1 is atop plan View of a casing slip embodying my invention. Figure '2 is an enlarged cross-section thereof taken on line 22, Figure 1. Figures 3 and 4: are perspective views of a slip-body and its replaceable liner, respectively. Figure 5 is a perspective view of the anchoring clip'for the liner. Figure 6 is a fragmentary horizontal section taken in the plane of line 6-.6, Figure 2.

Similar characters of reference indicate corresponding parts throughout the several views. v

In the. preferred embodiment of the invention shown in the drawings, the casing slip is composed of a plurality of slip. units adapted for engagement with the tapered opening of the customary table or spider bushing (not 1 shown) the pipe or casing extending through these slip units and suspended from them in the usual manner. As seen in Figure 1, each slip umt consists of a'plurality of sectors 10,

two being shown in the drawings, which are spaced radially and connected with each' other adjacent their upperand lower ends by links 11 pivoted to pivot rods or pintles 12 carried by the sectors. 1

Applied to theinner face of each of the slip-sectors 10 is a replaceable pipe-gripping member or liner 13 of uniform'thickness throughout its length and provided with readily threads or'wickers 14 to prevent the pipe from slipping downwardly relatively there-V to. The inner face of the slip-sector has a groove 15 therein for receiving the compa'nion liner, the upper and lower edges of the groove being undercutto provide oppositely facing shoulders, as indicated at 16, and the corresponding edges of the liner being tapered or beveled, as indicated at 17, whereby theliner is reliably held to its slip-sector against lateral displacement. A

The liner is detachably held against circumferential displacement relative to the slip-sector by means of a readily removable v clip or clamp applied to the upper end of the sector. This clamp preferably consists of a I substantially U-shaped member 18 adapted I to be seated in a radial notch or recess 19 formed in the top of the slip -sector, as shown in Figure 3, said notch extendingaround the contiguous sidesof the sector and intersecting the groove 15 in'the inner face of the latter. The top of the liner 13' has a notch 20 therein disposed to register with'and form a continuation of the notch 19 in the slip-sectorand the inner leg of the clamp 18 is adapt.- ed to extend into this liner-notch in the joined clainp is counter-bored, as seen at 22, so that the head of the bolt does not interfere or project beyond the toothedgripping face of the iner. In the application of the replaceable liner to the slip-sector,'the former isinserted in the receiving groove 15 in the latter, the clamp 18 is slipped over the notched upper ends of the companion parts and thebo-lt screwed in place. Theremoval of the slip is just as effected by the reversalof these op-. erations. V r r I claim as my invention 1. A casing slip oflthe character described... comprising a body having an upwardly-facing shoulder on its inner face and adjacent the lower end thereof, a replaceable liner i11 eluding pipe-gripping means applied to its inner face and seated at its lower'end on said shoulder, the upper end of'the liner I ithe body-notch one of its le s having a notch therein, and a clip secured to said body and having a part engaging said notch for preventing displacement of the liner relative to the body.

2. A casing slip of the character described, comprising a body having an upwardly-facing shoulder on its inner face and adjacent the lower end thereof, a replaceable liner including pipe-gripping means applied to its inner face and seated at its lower end on said shoulder, the upper end of the body and the liner having alining notches therein, and a retaining clip detachahly fitted in the body notch and having a part engaging said linernotch.

3. A casing slip of the character described comprisin a body having a groove in its inner face, the upper and lower edges of said groove ceing undercut, a replaceable-liner including pipe-gripping means applied to its inner face and having its upper and lower edges beveled to engage the corresporuling undercut edges of the body-groove, the upper edge of the liner having a notch disposed transversely thereof, and retaining clip detachably applied to the unner edge of the slip-body and having a p" t ifiesed to engage the notch in the up perjedge'et'the liner to hold it against transx-erse displace; the body-groove. v

4. A casing slip ofthecharacter comprising a body having agroea its inner face, the upper and lower edges. said groove being underciiit, a replaceable liner incliiidi ng pipc gripping neans applied to its inner lace and ham upper-and lower edges beveled to engage the 'corresp'ei'iding undercut edges of the body-groove, the up per edge of said slip-beihrhaving notch therein communicating with groove and the corresponding edge of the liner having a notch therein arranged to re. terlwit h said body-notch and a retaining clip a'ppliedto' the body-notch and engaging said linernotch.

comprising a body havi a roove in inner face, the upper a. clot/er edges or said groove being un-derei a 1 l laccahle LlJllQI including pipe-gripping means pap s and lower edges beveled to the corplied to its inner face and saving i responding undercut edges the bodygroove, the upper edge of said 53 i -l o(ly he With groove and the co1,'rrs onding er oi liner having a notch therei ran e to re ister with said body-notch, and a substantially u s'nnped clamp (lc-tachnhly seated in liner-notch to hold the lEDQl. a e verse displacen'rent in the i r dy-gro we.

FREDERICK J. OBRIEN.

5. A casing slip of the character described 

